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The act of smacking someone in the face with a dirty tampon...usually done as a prank but may also be an expression of affection.
Example 1)

Jeff: I'm still cleaning Krista's uterine lining out of my ear after that Ketchup Smooch she gave me last night.....

Example 2)

Baby Momma: If Myles doesn't start paying child support he's gonna get a ketchup smooch
by #ketchupsmooch January 19, 2016
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